Let me start with an overview of the method I followed.
I performed my analysis on the 449 journals appearing under the
Web of Knowledge's
computer science subject categories:
artificial intelligence; cybernetics; hardware & architecture;
information systems; interdisciplinary applications; software engineering;
theory & methods.
Note that journals may appear in many categories.
In particular, there are many overlaps between the above categories
and "electrical and electronic engineering" and "operations research and
management science".

In the preceding table we see that journals by for-profit publishers,
which started appearing en masse in the list last year,
are here to stay.
This year again we have three journals from this category:
Human-Computer Interaction (Lawrence Erlbaum Associates),
International Journal of Computer Vision (Kluwer), and
International Journal of Neural Systems (World Scientific).
Also interesting is that the list includes three signal-processing journals:
International Journal of Computer Vision,
SIAM journal on Imaging Sciences, and
Medical Image Analysis.
This is probably a spillover effect from the higher impact factor
observed in life science journals.

With 24 new journals in the list this year's pace is lower than last year's, but higher than the average rate
of 18 journals per year that was the case for 2006 to 2008.
However, this year's story is the international flavor of the added journals.
Five journals that serve area or country-specific audiences were added to the list:

All of them join the list with relatively low impact factors.
One thus wonders whether factors other than scientific impact,
such as regional coverage, come into play when the staff at Thomson Reuters decide which journals to index.
Finally, continuing the tradition of the past four years, the list includes one more security-oriented publication:
Wiley's Security and Communication Networks.
(For the title to make sense, you have to read it as formatted on the journal's cover:
SECURITY and Communication Networks.)

The list includes many journals that cover computer science applications;
a sign of a maturing and less introspective discipline.
Two journals in the list, the
International Journal of Computer Vision and the
IBM Journal of Research and Development, regain the significant ground they lost last year.

The story here is the The VLDB Journal: The International Journal on Very Large Data Bases,
whose impact factor fell from 6.8 in 2008, to 4.5 in 2009, to 2.1 in 2010;
the lowest value from 2005 onward.
The list also includes three journals that publish AI-related research:
Data Mining and Knowledge Discovery,
Expert Systems with Applications, and
Computational Intelligence;
a troubling sign for the AI community.
Finally, for the second year in a row the list includes a software engineering journal.
Last year it was the
ACM Transactions on Software Engineering and Methodology,
this year it's the
IEEE Transactions on Software Engineering.
Taking also into account this year's significant fall in the impact factor of the,
more practitioner-oriented, IEEE Software magazine,
the outlook for software engineering doesn't look hot either.